the Mega AK has been known as one of the strongest weapons in gmod. Liberty Prime (VJ Base) was one of the mightiest NPCs on the workshop with an amazing 30,000 health. but a simple click of the Mega AK was enough to OHKO (One Hit Knock Out) him. just recently a new series of SNPCs called the Painkiller Pack (also by VJ Base) came out, trumping some of the top tier NPCs including Liberty Prime, Miketama Overdrive (UBOA), and Mama Scarface (VJ Dinosaur pack). Alastor, one of the first major demon bosses came out with a whopping 245,000 HP topping the previous winner. but even he could not withstand a shot from the mighty Mega AK.

At this point, the thought of "does this gun have a limit to it's power?" crossed my mind. turns out: it does. in the Painkiller pack I found Lucifer: an SNPC with a record breaking health of 1,500,000... I shot Lucifer point blank range and his HP dropped to 60,000. after a little more experimenting, given the math of 1,500,000-60,000 means that a single point blank shot from the Mega AK does *900,000 damage per shot*. and that's only if you give a little click to the mouse. I mean, this weapon does not f**k around.

Additionally I did another experiment. I spread myself out and shot in a few different areas counting the number of bullets that were released. As you know the Mega AK spreads like a shotgun when fired and after several counts, I determined that it released 28 bullets per shot.
900,000÷28 means that each bullet from the Mega AK does approximately 32,100 damage. or to be exact 32,142.8571429 per bullet.

As for those of you having trouble, IDK what to say. I have vanilla Gmod. no Half-Life or CS:S and this swep has always worked perfectly fine for me. a shout out to the owner for making such a bad@$$ weapon. Also, if you are into NPCs go check out VJ Base. they have a great collection.